Ball Bearings

A ball bearing is a rolling bearing used within the power transmission industry. Ball bearings feature metal balls between an inner ring and outer ring. The rings feature raceways in which the balls sit. Ball bearings are designed to reduce rotational friction while supporting radial loads and axial loads. Incorporating a rolling element that guarantees a low coefficient of friction. Ball bearings ensure smooth and uninterrupted rotation of, for example, an axle or motor shaft.

With applications in everything from bicycle wheels to aerospace engineering, the ball bearing is a versatile rolling element bearing. They are ideal for high-speed applications with light to medium loads. For heavier loads, a Roller Bearing may be more suitable. Ball bearings are usually made from steel because of its durability. However, there are ceramic and plastic options available too. Single-row ball bearings are the most common, but double and triple rows are available too.

The only way for a ball bearing to operate efficiently or at high speeds is with the right lubrication which can work at high temperatures. The correct oil or grease lubricant has to be used with each bearing depending on its nominal lifespan and load. For further information about ball bearings and how to decipher the codes on them, see our ball bearings guide.


Types of Ball Bearings


Ball bearings are available in open and sealed versions, depending on the environment. They are also available in a range of diameters, supplied in metric sizes. Types include:


  • Deep-groove ball bearings are for when a higher load capacity is required.
  • Angular Contact ball bearings are used for combination axial and radial loads.
  • Linear ball bearings provide rotation in a single direction.
  • Miniature ball bearings are ideal for compact applications.
  • Self-aligning ball bearings used with long shafts and can handle misalignment.
  • Thrust ball bearings are used for axial loads.
  • Ceramic bearings are resistant to corrosion and very little lubrication.
  • Shielded bearings feature a rubber shield to protect the bearing from contaminants.

Ball bearings are used in objects with moving parts and have many applications. These include quite specific uses such as in appliances, machinery, gearboxes and centrifugal pumps.


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Description Price Inside Diameter Outside Diameter Ball Bearing Type Race Width End Type Flange Outside Diameter Number of Rows Static Load Rating Material Ball Material Cage Material Race Material Race Type Dynamic Load Rating
RS Stock No. 109-961
Mfr. Part No.FT8M/1B/D
BrandBNL
HK$16.12
Each
units
8.1mm 21.7mm Thrust 3mm - - 1 40kg Plastic Carbon Steel Acetal Acetal Plain -
RS Stock No. 747-620
Mfr. Part No.DDRIF-418ZZMTHA5P24LY121
BrandNMB
HK$68.49
Each (In a Pack of 2)
units
3.17mm 6.35mm Radial 2.76mm Shielded 7.51mm 1 97N Steel Martensitic Stainless Steel Metallic Crown Steel Martensitic Stainless Steel Flanged 285N
RS Stock No. 612-5880
Mfr. Part No.DDL-1470ZZMTRA1P24LY121
BrandNMB
HK$62.605
Each (In a Pack of 2)
units
7mm 14mm Radial 5mm Shielded - 1 511N Steel Martensitic Stainless Steel Metallic Ribbon Steel Martensitic Stainless Steel Plain 1.175kN
RS Stock No. 747-658
Mfr. Part No.DDRI-614ZZHA5P24LY121
BrandNMB
HK$55.92
Each (In a Pack of 2)
units
6.35mm 9.52mm Radial 3.17mm Shielded - 1 205N Steel Martensitic Stainless Steel Metallic Crown Steel Martensitic Stainless Steel Plain 417N
RS Stock No. 442-0076
Mfr. Part No.6203-2RSH
BrandSKF
HK$70.85
Each
units
17mm 40mm Deep Groove 12mm Sealed - 1 4.75kN Steel - Steel - Plain 9.95kN
RS Stock No. 540-334
Mfr. Part No.DDRF1350ZZMTRA5P24LY121
BrandNMB
HK$77.925
Each (In a Pack of 2)
units
5mm 13mm Radial 4mm Shielded 15mm 1 422N Steel Martensitic Stainless Steel Metallic Ribbon Steel Martensitic Stainless Steel Flanged 1.074kN
RS Stock No. 764-3746
Mfr. Part No.6208ZZC3
BrandNSK
HK$203.74
Each
units
40mm 80mm Deep Groove 18mm Shielded - 1 17.9kN Steel - Pressed Steel - Plain 29.1kN
RS Stock No. 286-8066
Mfr. Part No.6207
BrandSKF
HK$105.98
Each
units
35mm 72mm Deep Groove 17mm Open - 1 15.3kN Steel - Steel - Plain 27kN
RS Stock No. 285-0576
Mfr. Part No.61804-2RZ
BrandSKF
HK$146.13
Each
units
20mm 32mm Deep Groove 7mm Shielded - 1 2.32kN Steel - Steel - Plain 4.03kN
RS Stock No. 286-7530
Mfr. Part No.608
BrandSKF
HK$42.47
Each
units
8mm 22mm Deep Groove 7mm Open - 1 1.37kN Steel - Steel - Plain 3.45kN
RS Stock No. 286-8044
Mfr. Part No.6206
BrandSKF
HK$95.79
Each
units
30mm 62mm Deep Groove 16mm Open - 1 11.2kN Steel - Steel - Plain 20.3kN
RS Stock No. 540-384
Mfr. Part No.DDRF830ZZRA5P24LY121
BrandNMB
HK$80.545
Each (In a Pack of 2)
units
3mm 8mm Radial 4mm Shielded 9.5mm 1 176N Steel Martensitic Stainless Steel Metallic Ribbon Steel Martensitic Stainless Steel Flanged 553N
RS Stock No. 409-0439
Mfr. Part No.6203ZZ
BrandNSK
HK$62.04
Each
units
17mm 40mm Deep Groove 12mm Shielded - 1 4.8kN Steel - Steel - Plain 9.55kN
RS Stock No. 409-0502
Mfr. Part No.6205ZZ
BrandNSK
HK$82.85
Each
units
25mm 52mm Deep Groove 15mm Shielded - 1 7.85kN Steel - Steel - Plain 14kN
RS Stock No. 505-788
Mfr. Part No.7307 BEP
BrandSKF
HK$393.35
Each
units
35mm 80mm Angular Contact 21mm Open - 1 24.5kN Steel - Fibreglass Reinforced Nylon 66 - Plain 39kN
RS Stock No. 612-6136
Mfr. Part No.609SSM3MTLY121
BrandNMB
HK$19.625
Each (In a Pack of 2)
units
9mm 24mm - 7mm Shielded - - 1.368kN Steel - - - Plain 3.297kN
RS Stock No. 409-0798
Mfr. Part No.3204BTNG
BrandNSK
HK$299.31
Each
units
20mm 47mm Angular Contact 20.6mm Open - 2 12.5kN Steel - Polyamide - Plain 19.6kN
RS Stock No. 884-1228
Mfr. Part No.AC608Z/4N/D
BrandBNL
HK$42.61
1 Bag of 2
Bag(s)
8mm 22mm Radial 7mm Shielded - 1 7.5kg Plastic Stainless Steel Acetal Acetal Plain -
RS Stock No. 764-3516
Mfr. Part No.6312
BrandSKF
HK$622.88
Each
units
60mm 130mm Deep Groove 31mm Open - 1 52kN Steel - Steel - Plain 85.2kN
RS Stock No. 409-0495
Mfr. Part No.6205
BrandNSK
HK$71.48
Each
units
25mm 52mm Deep Groove 15mm Open - 1 7.85kN Steel - Steel - Plain 14kN